烧结工序协同处理市政污泥的试验研究

Experimental research on collaborative accessing of municipal sludge in sintering process

市政污泥作为一种生物质能,在铁矿烧结工序中处理可充分利用污泥中的水分和有机质,实现污泥的减量化、无害化和资源化。本文采用烧结工序协同处理市政污泥,并进行相关试验研究。结果表明:当烧结原料中干污泥占比在10%以下时,混合料在升温至1300℃过程中形状没有明显变化,同时随着干污泥占比的增加,混合料烧损率增大,烧损速率整体呈现上升趋势,且在600℃前尤为明显;随着干污泥占比的增加,烧结料中含碳量增加,烧结矿中铁氧化物还原程度加深;在干污泥占比小于1%时,烧结矿强度明显上升,继续增大干污泥占比后烧结矿的强度开始下降;干污泥占比小于1%对烧结矿整体成分的影响很小,而掺烧后污泥中有30%~45%的S和83%的P残留在烧结矿中,明显高于纯污泥燃烧后的残留量。因此,考虑到钢厂对成品烧结矿的成分要求,在烧结工序中协同处理干污泥的占比需要控制在1.5%以下。

As a kind of biomass energy,municipal sludge can make full use of the moisture and organic matter in the iron ore sintering process to realize the reduction,harmlessness and resource utilization of sludge.In this paper,sintering process is used to do collaborative accessing of municipal sludge in sintering process,and relevant experimental studies are carried out.The results show that,when the proportion of dry sludge in the sintering raw material is less than 10%,the shape of the compound does not change significantly during the heating to 1300℃,and with the increase of the proportion of dry sludge,the burning loss of the mixture increases,and the overall burning loss shows an upward trend,especially before 600℃.With the increase of the proportion of dry sludge,the carbon content in the sintering material increases and the degree of iron Oxide reduction in the sinter deepens.When the proportion of dry sludge is less than 1%,the sinter strength increases significantly,and the strength of sinter begins to decrease after continuing to increase the proportion of dry sludge.The proportion of dry sludge is less than 1%,which has little effect on the overall composition of the sinter,while 30%~45%of S and 83%of P remain in the sinter after adulteration sludge,which is significantly higher than the residue after pure sludge combustion.Therefore,considering the composition requirements of steel mills for finished sinter,the proportion of dry sludge on collaborative accessing in the sintering process needs to be controlled below 1.5%.